estimated at about thirty feet. The tympanies and vertebriB appear 

 very difficult to distinguish from those of 0. hupschi. 

 Hah. Europe (Belgium). 



M. 3529. The imperfect left tympanic ; from the Antwerp Crag. 



This specimen closely resembles the one figured by Van 



Eeneden in the 'Ann. Mus. R. Hist. Nat. Belg.' vol. ix. pt. 4, 



pi. xxix. fig. 8. By exchange ivith the Royal Brussels 



Museum of Natural History, 1886. 



M. 3524. The imperfect right tympanic ; from the Antwerp Crag. 



By exchange ivith the Royal Brussels 

 Museum of Natural History, 1886. 



Cetotherium hupschi^ Van Beneden -. 



Syn. Plesiocetus hupschi, Van Beneden^. 

 Fksiocetopsis hupschi, Brandt ^. 



This species is estimated to have been nearly equal in size to 

 Balcenoptera rostrata. 



Hah. Europe (Belgium, France ^, Portugal ^, and [?] England). 



43599. The imperfect centrum of an atlas vertebra belonging either 

 to this species or to C. hitrtini ; from the Antwerp Crag. 

 This specimen is slightly larger than the one figured by 

 Yan Beneden in the ' Ann. Mus. E. Hist. Nat. Belg.' 

 vol. ix. pt. 4, pi. xxvi. figs. 2, 3. Purchased. 



43602. The centrum of a lumbar and another of a caudal vertebra ; 

 from the Antwerp Crag. Purchased. 



32732. The centrum of a late lumbar vertebra ; from the Pliocene (?) 

 of Xabregas, near Lisbon, Portugal. This specimen is 

 referred to the present species by Yan Beneden in the 

 « Bull. Ac. E. Belg.' ser. 2, vol. 1. p. 19. 



Presented hy J. S. Valentine, Esq., 1857. 



The specific reference of the following specimens from the 

 Red Crag of Suffol.1: is provisional. 

 28267. The imperfect centrum of the axis vertebra ; from Wood- 

 bridge. This specimen agrees very closely with No. 43599, 

 and doubtless belongs to the same species. 



Purchased, 1852. 



1 Bull. Ac. E. Belg. ser. 2, vol. xxxiv. p. 17 (1872) 



2 Ibid. vol. 1. p. 19 (1880). 



3 Mem. Ac. Imp. St. Petersbourg, vol. xx. p. 144 (1873). 

 * Van Beneden, op. cit. vol. 1. p. 19. 



